Automatic cut-off for fuel of oil-burning boilers



Mar. 13, 1923., 1,4485%,

' P. H. GENTZEL.

AUTOMATIC'CUT-OFF FOR FUEL OF OIL BUR NING BOILERS.

FILED NOV. 17. 1919. 2 SHEETS-SHEET 1.

gwuww o Perm] Hfien'igea.

Mar. 13, 1923. 1,4485%, P. H. GENTZEL.

AUTOMATIG-CUT-OFF FOR FUEL OF OIL BURNING BOILERS. F lLED NOV. 17. 1919.

2 SHEETS-SHEET 2.

Boiler NWL 25 vention UNlTllll) STATES FFECCEO PERRY H. GENTZEL, 01ENEWTON, NASSACHU$ETT$ AUTOMATIC CUT-@FF FOB FUEL F OIL- BURNING BOILERS.

Application filed November 17, 1919. Serial No. 338,756.

To all whom it may concern:

Be it known that I, PERRY HOMER GENT- ZEL, a citizen of the UnitedStates, residing at Newton, in the county of Middlesex and State ofMassachusetts, have invented certainnew and useful Improvements in Aut0matic Cut-Offs for Fuel of Oil-Burning Boilers, of which the followingis a specification.

The object ofmy said invention is to provide a means whereby the flow offuel to the atomizer burner of an oil-burning boiler will beautomatically cut off when the water in the boiler has reached apredetermined low water level, thereby automatically extinguishing thefire and guarding against explosion, burning of boiler tubes, and otherdamage.

Referring to the accompanying drawings,

at which are made a part hereof, and on which similar referencecharacters indicate similar parts, I I Figure 1 is a side elevation ofan automatic control device embodying my said incertain portions beingshown in section to illustrate the construction more clearly,

Figure 2', a top or plan view, and Figure 3, a horizontal section on theCD dotted line 3--3 in Figure 1.

Figure 4c is a fragmentary view of the upper end of the control deviceshowing the parts in section.

Fggure 5 is an organization view showing 5 the control device inrelation to the boiler,

burner and fuel supply.

In said drawings the portion marked A represents the supporting base, Ba block, and C tie-rods, which several parts constitute the frame of thedevice.

Secured to head block A is a casting D 'containing parts andchambers fora purpose to be presently described.

Said base A has a boss on its upper face, formed with a centralperforation, in which is mounted a tube 11, preferably of copper orother metal readily expansible by heat, which tube has a head 14 whichfits slidably in a central perforation 14 formed in the head block B.The central portion of said pipe or tube ,11 is surrounded by a jacket12 of steel or other stitl" material for the purpose of maintaining saidtube in true alignment and preventing buckling regard less oftemperature.

Said head blockit is also formed with transverse port 13 communicatingwith tube 11 and also with a pipe leading to the boiler as shown at 23in Figure 5.

The upper end of tube 11 carries the head It adapted to press against adiaphragm 15 mounted over a perforation 16 in casing part D whichconnects with the fuel supply. Another perforation 17 leads from saidcasing D and connects with the pipe leading to the burner 0r atomizer.An annular flange 18 within casing D surrounds the lower end ofperforation 16, against which the diaphragm 15 is adapted to seat underexpension of tube 11 and close the passageway from perforation 16 toperforation 17 and cut offthe supply of fuel. A coiled spring 19 servesto hold the diaphragm away from said seat and maintain an openpassage-way under normal conditions.

In operation the tube'll is normally filled with water to the normalwaterlevel in the boiler, and under such conditions the parts aremaintained in the relative position shown in Figure 1 with thepassage-way for the flow of the liquid fuel open. hen, however, thewater in the boiler falls to a level on a plane with the opening 13, thewater in the tube will fall below said opening permitting the steam fromthe boiler to The tie-rods Q preferably pass through perforations in thesides of the base block A and have nuts 20 on their lower end, betweenwhich said base block are interposed heavy coiled springs 21, whichnormally hold said base block against jam nuts 22 on said rod C abovesaid base block, thereby providing a certain amount of elasticity in theoperation, which can be regulated by the adjustment of nuts 20, whichwill vary the tension of said springs 21 and provide for any extraexpansion of tube 11, as will be readily understood.

in Figure 5 the legend indicates the normal water level and LWL thelowest water level to which water will normally be permitted to fallorior to automatic re- L Should, however, the water level continue tollllll res ll ll connection between the boiler and the block A will beexposed to steam from the boiler which will cause the control device tooperate to cut off the oil supply to the burner as above described.

Having thus fully described my said in vention, what I claim as new anddesire to secure by Letters Patent, is:

1. A device for automatically cutting ed the flow of fuel of anoil-burning boiler when the water reaches a predetermined level in theboiler consisting of a frame, a head carried by sald frame and formedwith ports for connection with the oil supply and with the burner, saidports being formed to normally communicate with each other,

a diaphragm mounted over the end of one of said ports, a spring fornormally holding said diaphragm away from said end to maintaincommunication between said ports, an expansible tube mounted benea'thsaid diaphragm and arranged to support and operate the same, and aconnection from said tube to the boiler at the predetermined low Waterlevel therein, whereby when said level is reached steam will enter saidtube and expand the same and operate to force said diaphragm against theend of the port and close the fuel passage way to the burner,substantially as set forth.

2; The combination with an oil burning boiler of a device forcontrolling the'fiow of liquid fuel to the burner thereof, comprising athermostatically controlled oil cham-' predetermined low water levela'device for controlling the flow of liquid fuel to theburner thereofcomprising a thermostatically controlled oil chamber interposed in thefuel oil supply pipe, said oil chamber having a diaphragm which forms afloor for the said oil chamber and an, annular flange against which.said diaphragm is adapted to seat, a head adjacent the diaphragm eratedmeans for operatlng on the head when the predetermined low water levelis reached for forcing the diaphragm against the annular flange to cutoff the'oil'supply, substantially as set forth.

In witness whereof, I have hereunto set my hand and seal at Boston,Massachuand steam opsetts, this 2nd day of September, A. D. nineteenhundred and nineteen.

PERRY H. GENTZEL. [Ls] 'Witness: I

E. W. Bnanronn.

